Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19797#discussion_r153186151
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
---
@@ -334,7 +334,7 @@ case class RegExpReplace(subject: Expression, regexp:
Expression, rep: Expressio
ctx.addMutableState("String", termLastReplacement,
s"${termLastReplacement} = null;")
ctx.addMutableState("UTF8String",
termLastReplacementInUTF8, s"${termLastReplacementInUTF8} = null;")
- ctx.addMutableState(classNameStringBuffer,
+ ctx.reuseOrAddMutableState(classNameStringBuffer,
termResult, s"${termResult} = new $classNameStringBuffer();")
--- End diff --
seems we can just create the string buffer every time, the overhead is
small.
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